This property only applies when exporting the grid asyncrhonously.
AsynchronousExportDuration determines how much time is used by the grid to process an export operation. Each time the interval specified by AsynchronousExportInterval passes, the grid will begin (or continue) to process any pending export operations.
Target Platforms: Windows 10, Windows 8.1, Windows 8, Windows 7, Windows Server 2012, Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2